A history of the British sessile-eyed Crustacea . have been SPHjEROMA serratum. 407 formed into a distinct species, Sph. trigonum, by Risso(Crust, de Nice, p. 147). Wlien alive, the body is ashy coloured or whitish,varied w^ith reddish and dark grey ; the eyes black; theantennae fulvous; the legs ashy, with fulvous claws tippedwith black. Young individuals, measuring not more than two linesin length, have the outer edges of the side appendages ofthe tail (uropoda) entire, and not serrated. This species lives in numerous societies under stonesand amongst the pebbles and gravel of the coast; and
A history of the British sessile-eyed Crustacea . have been SPHjEROMA serratum. 407 formed into a distinct species, Sph. trigonum, by Risso(Crust, de Nice, p. 147). Wlien alive, the body is ashy coloured or whitish,varied w^ith reddish and dark grey ; the eyes black; theantennae fulvous; the legs ashy, with fulvous claws tippedwith black. Young individuals, measuring not more than two linesin length, have the outer edges of the side appendages ofthe tail (uropoda) entire, and not serrated. This species lives in numerous societies under stonesand amongst the pebbles and gravel of the coast; and isfound on the English and French coasts of the EnglishChannel, from Kent to Cornwall, and in the Medi-terranean. We have dredged fine specimens in PlymouthSound in the month of August. Dr. Kinahan obtainedit in the River Lagan, Belfast, and in the River Dodder,Dublin. We have observed quantities in the brackishstreams on Loughor Marsh, near Swansea, mixed withPalcemon, Carcinus, and Talitrus. 408 ISOPODA. NORM ALIA. SPH^ROMIDJ^. SPHtEROMA rugicauda. Specific character. Body smooth, moderately convex ; tail rounded andentire at tlie extremity, its upper surface rugose ; outer division of its lateralappendages oval and entire. Length, four-tenths of an inch. Splueroma ruyicauda. Leach, Edinb. Enc. vii. pp. 405 and 433. Soc. xi. p. 369. Dictionn. Sci. Nat. 346. Desmakest, Cons. Crust, p. 300. MilneEdwards, Crust, iii. p. 207. Johnston, 3, 180. White, B. M. Cat. Brit. Crust,p. 75. Pop. Hist. Brit. Crust, p. 245. This species closely resembles the preceding, but it isless convex, and is easily distinguished by the rugose orgranulated upper surface of the tail, and sometimes ofthe hinder segments of the body, and the simple outermargin of the external division of the uropoda. The head is narrower than the following segment, SPHiEROMA RUGICAUUA. 409 having the eyes on each side, which do not touch theexternal margins, and are not quite r
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Keywords: ., bookauthor, bookcentury1800, bookdecade1860, booksubjectcrustacea
